LXR linux/arch/mips/include/asm/pgalloc.h

   1/*
   2 * This file is subject to the terms and conditions of the GNU General Public
   3 * License.  See the file "COPYING" in the main directory of this archive
   4 * for more details.
   5 *
   6 * Copyright (C) 1994 - 2001, 2003 by Ralf Baechle
   7 * Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc.
   8 */
   9#ifndef _ASM_PGALLOC_H
  10#define _ASM_PGALLOC_H
  11
  12#include <linux/highmem.h>
  13#include <linux/mm.h>
  14#include <linux/sched.h>
  15
  16static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
  17        pte_t *pte)
  18{
  19        set_pmd(pmd, __pmd((unsigned long)pte));
  20}
  21
  22static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
  23        pgtable_t pte)
  24{
  25        set_pmd(pmd, __pmd((unsigned long)page_address(pte)));
  26}
  27#define pmd_pgtable(pmd) pmd_page(pmd)
  28
  29/*
  30 * Initialize a new pmd table with invalid pointers.
  31 */
  32extern void pmd_init(unsigned long page, unsigned long pagetable);
  33
  34#ifndef __PAGETABLE_PMD_FOLDED
  35
  36static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
  37{
  38        set_pud(pud, __pud((unsigned long)pmd));
  39}
  40#endif
  41
  42/*
  43 * Initialize a new pgd / pmd table with invalid pointers.
  44 */
  45extern void pgd_init(unsigned long page);
  46
  47static inline pgd_t *pgd_alloc(struct mm_struct *mm)
  48{
  49        pgd_t *ret, *init;
  50
  51        ret = (pgd_t *) __get_free_pages(GFP_KERNEL, PGD_ORDER);
  52        if (ret) {
  53                init = pgd_offset(&init_mm, 0UL);
  54                pgd_init((unsigned long)ret);
  55                memcpy(ret + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD,
  56                       (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
  57        }
  58
  59        return ret;
  60}
  61
  62static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  63{
  64        free_pages((unsigned long)pgd, PGD_ORDER);
  65}
  66
  67static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
  68        unsigned long address)
  69{
  70        return (pte_t *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, PTE_ORDER);
  71}
  72
  73static inline struct page *pte_alloc_one(struct mm_struct *mm,
  74        unsigned long address)
  75{
  76        struct page *pte;
  77
  78        pte = alloc_pages(GFP_KERNEL, PTE_ORDER);
  79        if (!pte)
  80                return NULL;
  81        clear_highpage(pte);
  82        if (!pgtable_page_ctor(pte)) {
  83                __free_page(pte);
  84                return NULL;
  85        }
  86        return pte;
  87}
  88
  89static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
  90{
  91        free_pages((unsigned long)pte, PTE_ORDER);
  92}
  93
  94static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
  95{
  96        pgtable_page_dtor(pte);
  97        __free_pages(pte, PTE_ORDER);
  98}
  99
 100#define __pte_free_tlb(tlb,pte,address)                 \
 101do {                                                    \
 102        pgtable_page_dtor(pte);                         \
 103        tlb_remove_page((tlb), pte);                    \
 104} while (0)
 105
 106#ifndef __PAGETABLE_PMD_FOLDED
 107
 108static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
 109{
 110        pmd_t *pmd;
 111
 112        pmd = (pmd_t *) __get_free_pages(GFP_KERNEL, PMD_ORDER);
 113        if (pmd)
 114                pmd_init((unsigned long)pmd, (unsigned long)invalid_pte_table);
 115        return pmd;
 116}
 117
 118static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
 119{
 120        free_pages((unsigned long)pmd, PMD_ORDER);
 121}
 122
 123#define __pmd_free_tlb(tlb, x, addr)    pmd_free((tlb)->mm, x)
 124
 125#endif
 126
 127#define check_pgt_cache()       do { } while (0)
 128
 129extern void pagetable_init(void);
 130
 131#endif /* _ASM_PGALLOC_H */
 132